python开发_tkinter_获取文本框内容_给文本框添加键盘输入事件

在之前的blog中有提到python的tkinter中的菜单操作

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下面是tkinter的获取文本框内容_给文本框添加键盘输入事件的操作

运行效果：

在输入的时候，单击回车键，触发：print_contents()

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代码部分：

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 from tkinter import *

 __author__ = {'name' : 'Hongten',

               'mail' : '[email protected]',

               'blog' : 'http://www.cnblogs.com/',

               'QQ': '',

               'created' : '2013-09-11'}

 # This program  shows how to make a typein box shadow a program variable.

 flag = True

 class App(Frame):

     def __init__(self, master=None):

         Frame.__init__(self, master)

         self.pack()

         self.entrythingy = Entry(self)

         self.entrythingy.pack()

         self.button = Button(self, text="Uppercase The Entry",

                              command=self.upper)

         self.button.pack()

         # here we have the text in the entry widget tied to a variable.

         # changes in the variable are echoed in the widget and vice versa.

         # Very handy.

         # there are other Variable types. See Tkinter.py for all

         # the other variable types that can be shadowed

         self.contents = StringVar()

         self.contents.set("this is a variable")

         self.entrythingy.config(textvariable=self.contents)

         # and here we get a callback when the user hits return. we could

         # make the key that triggers the callback anything we wanted to.

         # other typical options might be <Key-Tab> or <Key> (for anything)

         self.entrythingy.bind('<Key-Return>', self.print_contents)

     def upper(self):

         # notice here, we don't actually refer to the entry box.

         # we just operate on the string variable and we

         # because it's being looked at by the entry widget, changing

         # the variable changes the entry widget display automatically.

         # the strange get/set operators are clunky, true...

         global flag

         flag = not flag

         if not flag:

             str = self.contents.get().upper()

             self.contents.set(str)

         else:

             str = self.contents.get().lower()

             self.contents.set(str)

         print('the contents is : ', self.contents.get())

     def print_contents(self, event):

         print("hi. contents of entry is now ---->", self.contents.get())

 root = App()

 root.master.title("Foo")

 root.mainloop()

参考资料：

http://www.oschina.net/code/explore/Python-3.1.3/Demo/tkinter/matt/entry-with-shared-variable.py